Rarely do we like doing anything we have to, but we tell ourselves it's a necessary part of daily life. That's the difference between adults and children when it comes to unwanted tasks. But as Tim Ferris points out, the kids may make the smarter choices:

If you wake up on Saturday morning and go surfing to decompress for the week, that is different from having to wake up at six every morning Monday to Friday and take investment bankers out to surf. One is elective and one is mandatory. Adults and three-years-olds are very similar, in that as soon as we have to do something, we start to resent it. For instance with me, I don't like to do a lot of speaking engagements like a lot of authors do. I just find it really boring. I now only do two types: it's either top price or free. If you realize that income is intended to ultimately improve your quality of life in some fashion, then it makes it easier to forgo some the fleeting, high-maintenance opportunities.

Basically, Tim suggests you ought to do what offers the most reward—be it money or personal satisfaction. You may not be able to turn down the things you'll end up resenting every single time, but if you focus on the opportunities that offer more to you in one way or the other you'll at least minimize the bad stuff.